Good luck with the Tammy 28-300. I bought one and sold it less than a month later, I was having the same problems with it that you show with your test.
That 70-300 is a CA monster.
The Tokina and the "elitist" lens are far and away the best of the lot. The Tokina shows some CA but very good contrast. The "elitist" shows very good contrast with just a hint of CA.
If I were to choose one lens of this grouping in this test it would have to be the 135 f/1.8. The 18-250 actually is a surprise, it might actually be my second choice, close call between it and the Tokina zoom. I am looking strictly at IQ and not at range.
A good photograph is knowing where to stand.
Rule books are paper, they will not cushion a sudden meeting of stone and metal.
Ernest K. Gann-Fate is the Hunter.